row = int(input('请输入行数: ')) 

for i in range(row): 
    for _ in range(i + 1): 
        print('*', end='') 
    print() 


for i in range(row): 
    for j in range(row): 
        if j < row - i - 1: 
            print(' ', end='') 
        else: 
            print('*', end='') 
    print() 
            
for i in range(row): 
    for _ in range(row - i - 1): 
        print(' ', end='') 
    for _ in range(2 * i + 1): 
        print('*', end='') 
        print()
